闪光视觉不应见于（） A.视网膜脱离 B.急性视网膜脉络膜炎 C.急性玻璃体后脱离

交换两个（    ）的位置，积不变。

在做X线检查以前，应该进行的处理是()

A．行简单的外固定

B．行气压止血带止血

C．急送手术室

D．长腿石膏托固定

E．紧急输血、输液

（1）按系统命名法为下列有机物命名

①                                  ，②                                   ；

（2）根据名称写出有机物结构简式

2,5-二甲基-4-乙基庚烷                             ；

（3）戊烷（C₅H₁₂）的某种同分异构体只有一种一氯代物，试书写戊烷此同分异构体的结构简式：                                 ；

（4）有两种有机物都含有碳92.3%，含有氢7.7%，第一种有机物对氢气的相对密度为13，第二种有机物的蒸气密度为3.49 g/L（已折算成标准状况下的值）， 则第一种有机物的结构简式为                        ，第二种有机物的分子式为                        。

关于紫癜性肾炎肾活检的意义下列哪项是正确的（）。

A.有助于本病的诊断

B.明确病变严重程度

C.评估预后

D.有助于制定个体化治疗方案

E.以上皆是

Public protests can cause even the most powerful companies to change their policies. For example, an activist group recently staged a demonstration in front of the HydraBore corporate headquarters to protest the company’s use of the chemical Ectomazathol. Within three months of the demonstration, HydraBore replaced Ectomazathol in its production plants with another chemical.
Which of the following, if true, casts the most doubt on the connection between the public protest and the decision of the company to change chemicals ？（）

A. Preliminary studies show that the new chemical may be more carcinogenic than Ectomazathol.

B. The recently introduced chemical that is replacing Ectomazathol is less expensive and more effective in its industrial application than Ectomazathol.

C. HydraBore devoted no publicity efforts to announce its switch from Ectomazathol to the new chemical.

D. As protests against HydraBore have become more frequent, the company has subsequently increased its public relations budget.

E. The activist group that staged the demonstration has been linked to illegal acts of theft and sabotage within other corporate headquarters.